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check-subnet-mask.ps1
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<#
.SYNOPSIS
Checks the given subnet mask for validity
.DESCRIPTION
This PowerShell script checks the given subnet mask for validity.
.PARAMETER address
Specifies the subnet mask to check
.EXAMPLE
PS> ./check-subnet-mask.ps1 255.255.255.0
✅ subnet mask 255.255.255.0 is valid
.LINK
https://github.com/fleschutz/PowerShell
.NOTES
Author: Markus Fleschutz | License: CC0
#>
param([string]$address = "")
function IsSubNetMaskValid { param([string]$IP)
$RegEx = "^(254|252|248|240|224|192|128).0.0.0$|^255.(254|252|248|240|224|192|128|0).0.0$|^255.255.(254|252|248|240|224|192|128|0).0$|^255.255.255.(255|254|252|248|240|224|192|128|0)$"
if ($IP -match $RegEx) {
return $true
} else {
return $false
}
}
try {
if ($address -eq "" ) { $address = read-host "Enter subnet mask to validate" }
if (IsSubNetMaskValid $address) {
"✅ subnet mask $Address is valid"
exit 0 # success
} else {
write-warning "Invalid subnet mask: $address"
}
} catch {
"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
exit 1
}